An inventor has created a heat engine that extracts energy from geothermal hotspots and geysers like Old Faithful at Yellowstone National Park. She claims to turn all of the geothermal energy into work. Such a device is
A. a violation of the first law of thermodynamics.
B. consistent with Clausius's statement of the second law of thermodynamics.
C. a violation of Kelvin's statement of the second law of thermodynamics.
D. only possible for a Carnot cycle.
Answer: C
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In degenerate matter
a. pressure depends only on the temperature. b. temperature depends only on density. c. pressure does not depend on temperature. d. pressure does not depend on density. e. temperature depends only on density and does not depend on temperature.
Surrounding every moving electron is
A) a magnetic field. B) an electric field. C) both of these D) neither of these
The electric resistance of a superconductor is
A) zero. B) infinite. C) usually lower than ordinary resistors. D) none of the above
A proton that is initially at rest is accelerated through an electric potential difference of magnitude 500 V. What speed does the proton gain? (e = 1.60 × 10-19 C , mproton = 1.67 × 10-27 kg)
A) 2.2 × 105 m/s B) 1.1 × 105 m/s C) 9.6 × 105 m/s D) 3.1 × 105 m/s